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Theorem pnfnre 8280
Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.)
Assertion
Ref Expression
pnfnre  |- +oo  e/  RR

Proof of Theorem pnfnre
StepHypRef Expression
1 cnex 8216 . . . . . 6  |-  CC  e.  _V
21uniex 4540 . . . . 5  |-  U. CC  e.  _V
3 pwuninel2 6491 . . . . 5  |-  ( U. CC  e.  _V  ->  -.  ~P U. CC  e.  CC )
42, 3ax-mp 5 . . . 4  |-  -.  ~P U. CC  e.  CC
5 df-pnf 8275 . . . . 5  |- +oo  =  ~P U. CC
65eleq1i 2297 . . . 4  |-  ( +oo  e.  CC  <->  ~P U. CC  e.  CC )
74, 6mtbir 678 . . 3  |-  -. +oo  e.  CC
8 recn 8225 . . 3  |-  ( +oo  e.  RR  -> +oo  e.  CC )
97, 8mto 668 . 2  |-  -. +oo  e.  RR
109nelir 2501 1  |- +oo  e/  RR
Colors of variables: wff set class
Syntax hints:   -. wn 3    e. wcel 2202    e/ wnel 2498   _Vcvv 2803   ~Pcpw 3656   U.cuni 3898   CCcc 8090   RRcr 8091   +oocpnf 8270
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-un 4536  ax-cnex 8183  ax-resscn 8184
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-nel 2499  df-rex 2517  df-rab 2520  df-v 2805  df-in 3207  df-ss 3214  df-pw 3658  df-uni 3899  df-pnf 8275
This theorem is referenced by:  renepnf  8286  nn0nepnf  9534  xrltnr  10075  pnfnlt  10083  xnn0lenn0nn0  10161  inftonninf  10767  pcgcd1  12981  pc2dvds  12983
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